9fe0f6c7fc
- Adapt to Curve25519Kit renaming - Move non-modular CommonCrypto.h into .m files // FREEBIE
42 lines
1.2 KiB
Objective-C
42 lines
1.2 KiB
Objective-C
//
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// SerializationUtilities.m
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// AxolotlKit
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//
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// Created by Frederic Jacobs on 26/10/14.
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// Copyright (c) 2014 Frederic Jacobs. All rights reserved.
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//
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#import "SerializationUtilities.h"
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#import <CommonCrypto/CommonCrypto.h>
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@implementation SerializationUtilities
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+ (int)highBitsToIntFromByte:(Byte)byte{
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return (byte & 0xFF) >> 4;
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}
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+ (int)lowBitsToIntFromByte:(Byte)byte{
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return (byte & 0xF);
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}
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+ (Byte)intsToByteHigh:(int)highValue low:(int)lowValue{
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return (Byte)((highValue << 4 | lowValue) & 0xFF);
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}
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+ (NSData*)macWithVersion:(int)version identityKey:(NSData*)senderIdentityKey receiverIdentityKey:(NSData*)receiverIdentityKey macKey:(NSData*)macKey serialized:(NSData*)serialized {
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uint8_t ourHmac[CC_SHA256_DIGEST_LENGTH] = {0};
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CCHmacContext context;
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CCHmacInit (&context, kCCHmacAlgSHA256, [macKey bytes], [macKey length]);
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CCHmacUpdate(&context, [senderIdentityKey bytes], [senderIdentityKey length]);
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CCHmacUpdate(&context, [receiverIdentityKey bytes], [receiverIdentityKey length]);
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CCHmacUpdate(&context, [serialized bytes], [serialized length]);
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CCHmacFinal (&context, &ourHmac);
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return [NSData dataWithBytes:ourHmac length:MAC_LENGTH];
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}
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@end
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